USS Lynx II (SP-730), later USS SP-730, was an armed motorboat that served in the United States Navy as a patrol vessel and harbor dispatch boat from 1917 to 1919. Lynx II was built as a private motorboat of the same name for Nathaniel F. Ayer of Boston, Massachusetts, in 1917 by Herreshoff Manufacturing Company at Bristol, Rhode Island, designed with Navy patrol service in mind. The U.S. Navy purchased her from Ayer on 14 June 1917. She was enrolled in the on 21 June 1917, then commissioned on 9 July 1917 at Boston with Chief Boatswain's Mate S. O. Joyce, USNRF, in command for service during World War I.